A062335 -id:A062335 - cp's OEIS frontend

A062333 Primes starting and ending with 3.

3, 313, 353, 373, 383, 3023, 3083, 3163, 3203, 3253, 3313, 3323, 3343, 3373, 3413, 3433, 3463, 3533, 3583, 3593, 3613, 3623, 3643, 3673, 3733, 3793, 3803, 3823, 3833, 3853, 3863, 3923, 3943, 30013, 30103, 30113, 30133, 30203, 30223, 30253, 30293

Offset: 1

Amarnath Murthy, Jun 21 2001

Intersection of A045709 and A030431. - Michel Marcus, Jun 08 2013

			3413 is a member, as it is a prime and the first and the last digits are both 3.

Harry J. Smith, Table of n, a(n) for n = 1..1000

Cf. A062332, A062334, A062335.

se3Q[n_]:=Module[{idn=IntegerDigits[n]},idn[[1]]==idn[[-1]]==3]; Select[ Prime[ Range[3300]],se3Q] (* Harvey P. Dale, Jul 24 2019 *)

{ n=-1; t=log(10); forprime (p=2, 5*10^5, if ((p-10*(p\10)) == 3 && (p\10^(log(p)\t)) == 3, write("b062333.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 05 2009

More terms from Larry Reeves (larryr(AT)acm.org), Jun 29 2001

Offset changed by Andrew Howroyd, Sep 17 2024

A062334 Primes starting and ending with 7.

Original entry on oeis.org

7, 727, 757, 787, 797, 7027, 7057, 7127, 7177, 7187, 7207, 7237, 7247, 7297, 7307, 7417, 7457, 7477, 7487, 7507, 7517, 7537, 7547, 7577, 7607, 7687, 7717, 7727, 7757, 7817, 7867, 7877, 7907, 7927, 7937, 70067, 70117, 70157, 70177, 70207, 70237

Offset: 1

Amarnath Murthy, Jun 21 2001

			7687 is a member, as it is a prime and the first and the last digits are both 7.

Harry J. Smith, Table of n, a(n) for n = 1..1000

Cf. A062332, A062333, A062335.

{ default(primelimit, 800000); n=-1; t=log(10); forprime (p=2, 800000, if ((p-10*(p\10)) == 7 && (p\10^(log(p)\t)) == 7, write("b062334.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 05 2009

More terms from Larry Reeves (larryr(AT)acm.org), Jun 29 2001

Offset changed by Andrew Howroyd, Sep 17 2024

cp's OEIS Frontend

A062333 Primes starting and ending with 3.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Mathematica

PARI

Extensions